Fix GetNetworkList() for POSIX to cope with address-less interfaces.

net/base/net_util_posix.cc

Index: net/base/net_util_posix.cc
diff --git a/net/base/net_util_posix.cc b/net/base/net_util_posix.cc
index 0412792ebb2e38efcf67e3ad76ad53463508eb3b..9257989b9f6d76e7c2797be8f9598a6e887350c3 100644
--- a/net/base/net_util_posix.cc
+++ b/net/base/net_util_posix.cc
@@ -75,6 +75,8 @@ bool GetNetworkList(NetworkInterfaceList* networks) {
   }
 
   for (ifaddrs *ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
+    if (!ifa->ifa_addr)
+      continue; // Interface has no IP addresses, so skip it.
     int family = ifa->ifa_addr->sa_family;
     if (family == AF_INET || family == AF_INET6) {
       IPEndPoint address;